To do it: Start in a plank position with one small towel placed under each ball of your foot, legs together. Bring your left knee in towards the right side of your chest, squeezing your abs. Then, straighten your right leg back out to full plank and bring your right knee in towards the left side of the your chest and back out to full plank. Next, draw both knees into your chest at the same time and then slide your legs back out to full plank. That’s one rep. Build up to 3 sets of 12-15 reps (resting in between).
Begin in the basic plank position. Your torso will be in a straight line from head to toe and avoid any drooping or sagging of the hips or shoulders. Also, avoid arching your back, or hanging your head. Warm up by maintaining the plank for at least 60 seconds while maintaining control. If you start shaking or losing form, drop to your knees and rest a few seconds and continue until you've completed a full minute
Once your dietary concerns are out of the way, it’s time to train those abs! Abs are just like any other muscle group, but smaller than most. That means you need to train them and let them recover just like any other muscle. So we recommend doing this weighted ab workout no more than every other day making sure to allow your abdominal muscles to recover completely.
“I alternate between all-out effort sprints (30 to 60 seconds) and walk/jog as a recovery until I feel fatigued. Intensity is key. Abs work as stabilizing muscles during a sprint, so the harder I push myself the harder my abs will work! Plus, there’s no equipment required, and I get a high calorie burn and full-body workout done in very little time. (I tell myself I can do anything for 30 seconds.) Depending on how I feel, I’ll either add this to the end of a routine or make it my entire workout, two to three times a week.” —Suzanne Cover, @suzannecover
That's why Jack recommends doing 360 abs to sculpt a washboard stomach and improve core stability all at once. While in a pushup position, you must keep your torso completely still as your legs create sweeping circles in different directions. Doing smaller loops hit your six-pack muscles, while bigger ones hit your entire midsection including your obliques, hips, and lower back.
Exercise also can't erase a couple factors beyond your control, experts say. "I think age plays a critical role in how easy or hard it is to get 'six-pack abs.' It's all about hormones – when we are younger, we have more circulating androgen hormones, which affords us the ability to not eat clean and yet continue to be shredded," Chait says. Our androgen hormone levels decline after we reach age 27, he says. (Testosterone is an androgen hormone in men. In women, a primary purpose of androgens is to be converted into female hormones known as estrogen.) After that age, "we need to focus more on dietary adjustments to maintain a lean body," Chait says.
A University of Southern Maine study found that a single set of a weight-training exercise torches as many calories as running at a 6-minute-mile pace for the same amount of time. So for every second you spend lifting weights, your body is expending high amounts of energy. Add high intensity interval training (HIIT) principles to your workout, and you could see even more gains.
Eat carbs. "There's this notion that carbs are bad and that you need crazy amounts of protein to be lean and fit," says Alcantara, who disagrees, and eats just as much carbs as protein, although the ideal ratio varies based on your goals. "Whatever you eat to get the results you want has to be sustainable, otherwise you're going to end up right back where you started with the same habits that got you there."